Automatic graphophone-stop.



M. H- BA'ETZNER. AUTOMATIC GRAPHOPHONE STOP. APPLICATION FILED SEPT;22,1911.

41,065,578, Patented June 24,1913.

. 2 sums-sum 1.

. hieaiom ax E a t I-, r p

M. H. BAETZNBR.

.AUTOMATIG GRAPHOPHONE STOP.

APPLIOATION FILED SEPT. 22, 1911.

1,065,578. Patented June 24, 1913 ZSHEETS-SHEET 2.

win 1:9 4- I fizz/71202;

y ulld x 5 5 546 I ma);

WMQ'

' carried. The needle the exterior extremity UNITED STATES PATENT oniuon.

MAX H. IBAETZNER, OF CHICAGO, ILLINOIS.

AUTOMATIC GRAPHOPHONE-STOP.

Specification of Letters Patent.

Patented Jane 24, 1913.

- Application filed September-22, 1911. Serial No. 650,794.

ETZNER, a a resident be susceptible of adjustment whereby thetone arm or horn. of the graphophone shall be arrested at the proper moment for any given record.

The invention consistsin the combinations and arrangements of parts hereinafter -described and claimed. I

The invention will be best understood by reference to the accompanying drawings forming a which, Figure 1 is a top plan view of a g-raphopart of this specification, and in phone of the disk record type equipped with my invention, Fig. 2 is a perspective view of L the graphophone showing the general ai-' rangement of the trip-device employed in connection therewith, and Fig. 3 is a verti cal section taken on line w-zv of Fig. 1.

The preferred form of construction as illustrated in the accompanying comprises a graphophone of the conventional form and supported by a stand 1. The tone arm 2 or that portion of the horn which extends above the stand 1 is swiveled to said stand to swing in a horizontal plane, this being the preferred construction. The mouth of the horn is invisible and extends from the swiveled portion of the tone arm of the horn into the interior of the stand 1. The turn-table 3 which is of the usual construction is mounted upon the stand 1, and on it the record disk plate, not shown, is point 4 provided at of the tone arm 2 of the horn is adaptedto be swung .into inoperative position as shown in Fig. 2, the operative position of said needle pointbeing vertical and over the record plate carried by the turn-table 8. In playing a piece of music the needle point 4 is brought to the exterior of the disk record and gradually moves radially during the playing of the record, consequently the arm 2 is actuated by the needle point 4 in the usual manner. Unless an audrawings ersesthe groove of the record shall have suflicient leverage to readily operate the stop device' is a trip. arm 6 which ispivoted to the top of the stand as at 7 and provided with an adjusting screw 8 which is arranged tangentially to the path of rotation of the block 5 and adapted to contact with the same at the proper moment during its revolution. Lock-nuts 9 are provided on the adjusting screw 8 in order that the same shall be held rigidly in position at the free end of the trip arm 6. The trip arm 6 is in i the form of a bell crank, but the pivot thereof is at one extremity as shown in Fig. 1. A bell crank lever is pivoted to the top of the stand 1 as at 10, there being a plate 11 screwed to, the stand top in order to..reinforce the pivots 7 and 10. The short arm 12 of the bell crank lever is adapted to be Coiiperating with the block 5 i in normal engagement with the trip arm 6,

a helical tension spring 13 connected with said trip arm being adapted to maintain said engagement. The long arm 13 or free end of the bell crank lever constitutes a" finger-piece by means of which the same is readily manipulated by the operator. Formed integral with the finger-piece l3. and extending upwardly therefrom is a fork 14 having fork being clearly illustrated in sideelevation in Fig. 3. Extending upwardly from the plate 11 on opposite sides of the fingerpiece 13 are perforated lugs 15 in which is slidably spring-pressed brake pin 16,- the same being arranged radially to the turn-table 3, and;

the spring 17 thereon abutting one of the lugs 15 as illustrated in Fig. 1.. The other end of the spring 17, which is a compression helical spring, abuts a diametrically disposed pin 18 which projects from opposite sidesof the brake pin 16 and is adapted to move said brake pintoward the periphery 19 of the turn table 3 by cotiperating with horizontally disposed sides, saidmounted a horizontally disposed rotary motion of the same.

the spring 17. In the normal position of the parts as shown in Fig. 1 the spring 17 is prevented from acting onthe pin 18 since the short arm 12 of the bell crank lever is in engagement with the triparin 6, but upon disengagement of said trip arm from the arm 12 it is apparent that the sprin 1? will expand and force the head 1610f the b rake pin 16 into engagement with the periphery 19 of the turn-table 3, thus arresting the Interposed between the diamctrie pin 18 and the fork 14 is a asher or collar 20 which is provided to render the connection of the pin 18 with said fork more durable.

The mode oi operation is as follows: Assuming that a record plate has been placed upon the turn-table 3 and that the latter has been given a rotary motion, then the needle point 4 is engaged with the record plate adjacent the periphery thereof in the usual manner. During the playing of the music the arm 2 gradually moves toward the center of the plate, consequently the block 5 will approach the adjustable screw 8. WVhen the block 5 contacts with the screw 8 after the music has been rendered the block 5 will etfect slight oscillation oi the trip arm 6, whereupon the short arm 12 of the bell crank will be disengaged theret'ron' This action causes the release of the spring 17 which immediately expands and forces the head 10 of the brake pin 16 into engagement with the periphery 15) ot' the turn-table 3, thus rctarding and arresting its motion by frictional contact. ()no side of the graphophone casing is elevated slightly by means of a block or wedge 21 so that upon the graphophone needle leaving the grooves in the disk at'ter thercntlition ot' a record the same will engage an inclined smooth surface and be carried toward the center of the disk by gravity. The momentum of the tone arm thus developed by gravity furnishes the power ncccssarv tor moving or oscillating the 'trip arm. The weight of the toncarni also facilitates this action, since a certain' amount of power is necessary to overcome the inertia oi ,1 d arm. The adjusting screw 8 may he suitably :nljustcd for any given plate used on the machine as atoresaid.

Due to the l ')]tl'\'ll!tit ot tier contact block :3 to the ccntrr of rotation ol the tone arm 2 this stop device is very sensitive and elliricnt in its operation.

\Vhile l have illustrated preferred form oi construrtion to! carrying my invention into rtl'ectv this is capable precise details of construction set forth. but

desire to avail myself of such variations and iodifications as come within the scope of the appended claims. For instance in the construction shown the lcverG is arranged for Contact with the block 5. It is understood that if desired said lever may be tended so that the same will contact directly with the tone arm.

Having described my invention what I claim as new and desire to secure by Letters Patent is: p

1. An automatic brake comprising a spring held trip lever adapted to oscillate about a stationary pivot and provided with an adjustable screw at the free end thereof; a bell crank lever the short arm of which is held in normal engagement with said trip arm and the long arm of which constitutes a finger piece; a fork formed in rigid relation with said finger piece and having horizontally extending sides; a spring pressed pin having a brake head and held in inoperative position by said fork; and means engaging said screw to operate said trip arm substantially as described.

2. An automatic brake comprising a trip arm; an adjustable screw on the free end of said trip arm; a bell crank lever having a short arm for engagement with said trip arm and a long arm constituting a linger" piece; a tension helical spring arranged in connection with said trip arm and adapted to maintain the engagement thereof with said lover; a fprk provided on the upper side of said finger piece and having horizontally extending sides; a spring pressed pin hav ing a brake head; a diamciric pin provided in said spring pressed pin; a collar engaging said diamctric pin and disposed on the side of said'tork opposite said head. said diamctric pin thus holding said head in inoperative position during the engagement oi said trip arm with said bell crank lcvcr. the construction being such that when said trip arm is tripped. the spring on said spring pressed pin will-cause the (nicrativc r-ngagi cent of the head; and automatic moan. adapted to engage said screw and trip said trip arm. substantially as described.

in testimony \vhcrco'l' l have signed my name to this spccilhation in thc ]')lt. \llr't ol' t'wo subscribing witnesses.

Copies of this patent may be obtained for five cents each. by addressing the Coniniissimisr ct Patents.

lltl 

